1919013818 has 8 divisors (see below), whose sum is σ = 2879327412. Its totient is φ = 959238016.

The previous prime is 1919013797. The next prime is 1919013821. The reversal of 1919013818 is 8183109191.

It can be written as a sum of positive squares in 2 ways, for example, as 1144671889 + 774341929 = 33833^2 + 27827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1919013818² = 7365228067349874248, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125405 + ... + 139872.

Almost surely, 2^1919013818 is an apocalyptic number.

1919013818 is a deficient number, since it is larger than the sum of its proper divisors (960313594).

1919013818 is a wasteful number, since it uses less digits than its factorization.

1919013818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268896.

The product of its (nonzero) digits is 15552, while the sum is 41.

The square root of 1919013818 is about 43806.5499440438. The cubic root of 1919013818 is about 1242.6801675509.

The spelling of 1919013818 in words is "one billion, nine hundred nineteen million, thirteen thousand, eight hundred eighteen".